Republican presidential candidate, former Massachusetts Gov. Mitt Romney, and his wife Ann, arrive for a Romney for President Iowa Caucus night rally in Des Moines.

Credit: AP Photo/Charlie Neibergall

Rep. Michele Bachmann, R-Minn., addresses her supporters at her caucus party at the Marriott in West Des Moines after finishing sixth in the Iowa Caucuses Tuesday night Jan. 3, 2012.

Credit: The Des Moines Register,AP Photo/Justin Hayworth

Republican presidential candidate, Texas Gov. Rick Perry, pauses on caucus night Tuesday in West Des Moines, Iowa. Perry announced in his remarks that he would return to Texas to "reassess" his campaign and determine whether there is a "path forward" for him in the 2012 race.

Credit: AP Photo/Evan Vucci

Rep. Ron Paul and his wife Carol Paul greet supporters during a rally on the night of the Iowa caucus at the Courtyard Des Moines Ankeny on January 3, 2012 in Ankeny, Iowa. Paul came in third in the Iowa GOP caucuses.

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Voters register at the Ankeny 9 Republican caucus on January 3, 2012 in Ankeny, Iowa. Iowans were preparing to caucus to vote for their favorite Republican candidate for president.

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A boys sits behind a desk for electoral official to register voters during Republican caucuses at a school in Des Moines, Iowa, on January 3, 2012.

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An elderly couple register to vote during Republican caucuses at a school in Des Moines, Iowa, on January 3, 2012.

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A worker walks past bags of balloons as a hotel ballroom is prepared for an Iowa republican presidential caucus victory party for Santorum.

Credit: AP Photo/Charlie Riedel

Voters register to cast their ballots during republican caucuses at a school in Des Moines, Iowa, on January 3, 2012.

Members of the Duggar family, prominent supporters of Republican presidential hopeful and former U.S. Sen. Rick Santorum, watch live news reports showing Santorum in the lead at the Stoney Creek Inn on January 3, 2012 in Johnston, Iowa.

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Observers for the candidates and spectators gather to watch volunteers count the ballots for the Republican presidential nominee during a caucus in the cafeteria at Kennedy High School in Cedar Rapids, Iowa on Tuesday, Jan. 3, 2012.

Credit: Cliff Jette,AP Photo/The Gazette

Paul and his wife Carol Paul look on during a rally on the night of the Iowa caucus at the Courtyard Des Moines Ankeny on January 3, 2012 in Ankeny, Iowa.